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Table 3 Comparison of baseline characteristics of patients available for follow-up versus those not available

From: Impact of oral vitamin D supplementation on serum 25-hydroxyvitamin D levels in oncology

Characteristic Patients with follow-up data (N = 799) Patients without follow-up data (N = 852) p-value
Mean age at presentation (SD) 55.0 (9.8) 55.5 (10.1) 2 sample t-test 0.37
Cancer Site    
   Breast 182 (52.4) 165 (47.6)  
   Lung 120 (44.8) 148 (55.2)  
   Pancreas 60 (38.2) 97 (61.8) Chi-square
   Colorectal 90 (51.7) 84 (48.3) 0.03
   Prostate 60 (45.5) 72 (54.5)  
   Others 287 (50.1) 286 (49.9)  
Gender    
   Males 266 (42.4) 362 (57.6) Chi-square
   Females 533 (52.1) 490 (47.9) < 0.001
Treatment History    
   Newly Diagnosed 410 (53.3) 359 (46.7) Chi-square
   Previously Treated 389 (44.1) 493 (55.9) < 0.001
Stage at Diagnosis    
   Stage 0 8 (38.1) 13 (61.9)  
   Stage 1 106 (54.6) 88 (45.4)  
   Stage 2 164 (49.4) 168 (50.6) Chi-square
   Stage 3 208 (52.8) 186 (47.2) 0.02
   Stage 4 244 (43.1) 322 (56.9)  
   Indeterminate 69 (47.9) 75 (52.1)  
  1. SD = Standard Deviation
  2. Numbers in parenthesis for cancer site, gender, treatment history and stage at diagnosis are row percentages